Shandilya Rishi said: Dear Parikshit and Vajranabha! I will tell you the secret of Vrajabhumi. Listen carefully. The meaning of the word “Vraja” is all-pervasive. According to ancient opinions, this land is named Vraja because it is all-pervasive. This land is an all-pervasive spiritual manifestation, situated beyond the three modes of material nature. Therefore this is called Vraja. This land is ever-blissful, effulgent, indestructible, and the abode of liberated souls.

There is more explanation on the link.

aham — I

tva — unto you

sarva–papebhyo — the entire fearful of sin

moksasyisyami — will deliver I you of

Ma — us

sucah — happiness

Iksvakave Full Meaning:

Our entire duty lies in attempt to give up ourselves “alone” or in solitude (because it is in solitude we understand and process god). To whom we surrender to or take shelter in this all pervasive land (that has unwelcome physical influences and effects) (see the link on Vraja Bhumi). I, in you — I am in you, the entire fearful of sin will deliver I you of us or our happiness.